So again with the gold but in reality a lot of films use gold because of its worth. In the movie the italian job, they again are stealing gold. to transport the gold, they outfit mini coopers by using weights to simulate the weight of the gold and then make the modifications to the suspension, chasis etc.. to be able to handle and manuver while still keeping good horsepower. This ll is plausable from a standpoint of being able to make the necessary modifications to the select components. The problem in this example is that the weight either the gold or the steel plates would not be supported by the frame. Many cars today are made with a unibody design. this design is widely used but is much weaker in design than a straight frame which today is used primarily in industrial equipment or in some trucks. the flaw in the unibody design is that under those weight conditions, the unibody design would crimp and fracture due to design.
The unibody design is can be best described by the carfax site. The link is http://www.carfax.com/car_buying/car_frames.cfx.
Basiclly the detailed information is in the link but for an overall assesment, The unibody design is a cast uniform frame that is a mold. This creates weak spots in the design when loading because you take away the potentially stress releasing sites that comes from assembling the body in several pieces.
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